Then Chris Cornell and Jerry Cantrell showed up. Here is a YouTube video in which the former Soundgarden frontman joins Eddie Vedder for "Hunger Strike," thus reforming the complete lineup of Andrew Wood/Mother Love Bone tribute band Temple of the Dog:

Skeptics will note that not only did Cornell hit the high notes, he probably could have hit them even harder. That was pretty dang awesome. Unfortunately, no one has yet produced video of Alice in Chains' Jerry Cantrell hopping on stage to close out the night with the guitar solo on "Alive," and perhaps that’s just as well: Suddenly unoccupied, PJ guitarist Mike McCready gallivant about the stage like the grunge fairy, flinging handfuls of picks to the admittedly floored crowd throughout the singalong number, and eventually ending up shirtless. Cantrell, for the record, effing killed the lick.

So let this be a lesson to all the Pearl Jam fans out there: Always buy tickets for all four shows.